Molting Monarchs

Have you ever watched a caterpillar molt or shed its skin? It's really cool! These are monarch caterpillars, but all species of butterfly and moth larvae do this at least five times.

First they spin a silken pad under themselves.Then, in muscular movements, after they've pumped enough fluid between the old and new skin, they wriggle out, head first.The head capsule soon falls off (the caterpillar often has to rub or knock it off), revealing a lighter face that will darken within a couple of hours. Usually, after it's "rested", the caterpillar will turn around and eat its old skin. Not all species do this, and not all species that usually do this will eat their skin every time.

The last time they molt, the pupa is revealed. Most moths, and only a few butterflies, will first spin a cocoon, pupating shortly after the cocoon has been constructed.

It's truly fascinating to watch! --LKR

Monarch Eggs and Caterpillars

This morning, I found a creamy white colored monarch egg under one of the leaves of a small milkweed plant's leaf. Hearing of possible drenching rains in the forecast for later on, today, I headed over to the fields down our street on a mission to save other monarchs!!!

My youngest daughter came along to help gather up more. Pictured above are the 19 eggs we found in about an hour. We also found 15 very young caterpillars. At the beginning of the summer months, I used to check our milkweed garden two to three times a day for newly laid eggs. If I didn't get them first, the ants and spider mites often did!

These are first instar caterpillars. An instar is the period between molts. Caterpillars molt, or shed their skin, several times as they grow, just like a snake does.

These two larvae hatched a few days apart from each other. These two larvae are getting ready to shed their skin.

Smaller larvae are often found hidden among the newer, tightly packed leaves at the top of the milkweed.

This is how we've raised most species of butterflies for well over a decade with great success. (This method should not be used for swallowtails.) Eggs, as well as the first two instars of a caterpillar's life, need more humidity or they often quickly dry up and die. However third, fourth, and fifth instar larvae easily pick up diseases and die if kept in this much humidity.
--LKR